Recycling and reusing method for waste HDDR bonded neodymium iron boron permanent magnets

The invention provides a recycling and reusing method for waste HDDR bonded neodymium iron boron permanent magnets and belongs to the technical field of material preparation methods. The recycling and reusing method for the waste HDDR bonded neodymium iron boron permanent magnets is short in technological process, low in cost and capable of facilitating industrialization. According to the technical scheme, the similarity and intermiscibility theory, after the waste HDDR bonded neodymium iron boron permanent magnets are subjected to swelling in a mixed solvent for a period of time, swelled epoxy resin on the surfaces of HDDR magnetic powder is stripped off through water bath stirring and ultrasonic cleaning methods so as to recycle the magnetic powder; the recycled magnetic powder and magnetic powder sold on the market are mixed in proportion and used for preparing HDDR bonded neodymium iron boron permanent magnets. By means of the method, epoxy resin bonding agents on the surfaces of magnetic powder can be effectively removed without damaging the properties of magnetic powder, so that the properties of original magnetic powder and magnets are maintained for recycled magnetic powder and prepared magnets to the maximum extent.